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(11) | EP 0 361 043 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Injection molding nozzle having nose portion with heating element encircling the bore and method |
(57) An integral sprue gated injection molding nozzle (10) and method having a melt bore
(38) extending centrally therethrough wherein a circular forward end portion (100)
of the electrical heating element (68) encircles the melt bore (38) in the nose portion
(24) to provide additional heat adjacent the gate (42). The method includes locating
the circular portion (100) of the heating element (68) in a circumferential space
(172) between a hub member (146) and a funnel member (120) and integrally brazing
them together in a vacuum furnace to form the nose portion (24) of the nozzle. The
nose portion (24) is drilled and machined to provide the desired gate (42) and configuration
depending upon the particular application. |